The Arduino Inventor's Guide
Learn Electronics by Making 10 Awesome Projects
By Brian Huang and Derek Runberg
Arduino Playground
Geeky Projects for the Experienced Maker
By Warren Andrews
The Arduino Project Handbook
25 Practical Projects to Get You Started
By Mark Geddes
Arduino Project Handbook Vol. 2
25 Simple Electronics Projects for Beginners
By Mark Geddes
Arduino Workshop
A Hands-On Introduction with 65 Projects
By John Boxall
Defend Your Base with Simple Circuits, Arduino, and Raspberry Pi
By Simon Monk
Python Playground
Geeky Projects for the Curious Programmer
By Mahesh Venkitachalam
The SparkFun Guide to Processing
Create Interactive Art with Code
By Derek Runberg